30-year climate normals

Middlesex County Climate and Weather Averages

Hottest month — July

85.1°

average daily high. The coldest month is January, averaging a low of 18.2°F.

Middlesex County gets 42.6" of precipitation a year, and 28% of it falls in Oct, Nov, Dec.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	36.8°	18.2°	2.90"
February	39.4°	19.3°	2.69"
March	47.5°	27.2°	3.85"
April	59.9°	37.1°	3.84"
May	70.4°	46.7°	3.36"
June	79.4°	56.2°	3.72"
July	85.1°	62.0°	3.51"
August	83.6°	60.3°	3.47"
September	75.7°	51.8°	3.54"
October	63.6°	40.8°	4.24"
November	52.4°	32.4°	3.72"
December	42.0°	24.0°	3.76"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 28% falling in the wettest three months (Oct, Nov, Dec).

January 2.90"

February 2.69"

March 3.85"

April 3.84"

May 3.36"

June 3.72"

July 3.51"

August 3.47"

September 3.54"

October 4.24"

November 3.72"

December 3.76"

Annual total 42.6"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 743

Heating degree days How much heating the climate demands 5,996

Approximate annual cooling cost At 28.82¢/kWh, Massachusetts average $214

Approximate annual electric heating cost Lower where heating is gas rather than electric $605

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Middlesex County, where electricity is one line of eight.

Common questions

What is the weather like in Middlesex County?

Middlesex County averages a high of 85.1°F in July and a low of 18.2°F in January. Annual precipitation is 42.6 inches, with essentially no snow.

When is the rainy season in Middlesex County?

The wettest stretch is Oct, Nov, Dec, which accounts for 28% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Middlesex County?

The average daily high in July, the hottest month, is 85.1°F. That drives 743 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Middlesex County?

Effectively no. Measurable snowfall is rare in Middlesex County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station BEDFORD HANSCOM FLD, MA US (USW00014702), 5.4 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Massachusetts residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.